The San Francisco Framework

How useful is an OO framework?

A framework is ...

a collection of components
a generic solution for a class of problems
a frame of mind for solving problems
a set of architectural constraints

The San Francisco Framework

is meant to develop business applications
is based on Java technology
may solve 70% of your problem
leaves 30% (minimum) to solve for you
may set a standard
or may fail to do so ...

San Francisco - motivation

The project was started when several software vendors asked IBM to help modernizing their application products
However, there were several barriers preventing them from being able to update their applications

Barriers to modernizing

(1) The problem of how to retrain their development staff to effectively use OO technology.
(2) The risk involved in moving to a new technology.
(3) moving -> the cost of the change

The software developers realized they needed some basic infrastructure. Many companies could not develop this infrastructure themselves.

San Francisco - the press

The San Francisco project helps to solve these problems by offering developers Business Process Components, designed as frameworks that provides an object oriented infrastructure, a consistent application programming model, and some default business logic
The frameworks make it easier to move to OO technology because developers use well-tested services instead of building their own.

San Francisco Framework - layers

Core Business Process Layer - the highest
Common Business Objects Layer - middle
Foundation Layer - lowest

Core Business Processes

The objective for this layer is to create a sound architecture and highly extensible OO implementation for the basic structure and behavior which any application provider delivering a solution in the application doamin would require:

Accounts Receivable/Payable Ledger
General Ledger Framework
Sales Order Management Framework
Purchase Order Management

Common Business Objects

Business Objects common to multiple domains
Common Application level Services

CBO:

Business Partner
Address
Number - decimal structure
Currency - how many euros in a dollar?

Foundation Layer

Foundation Object Model Classes
Utilities

in other words: it provides the infrastructure comment: reinventing the wheel is not a big problem, because the wheel is a terrific invention

Foundation Object Model Classes

Command
Entity
Dependent
Collection/Iterator
Factory

you need to study Design Patterns to appreciate these ...

Using the San Francisco Framework

The San Francisco Frameworks are designed to make many types of extensions easy for application developers:

overriding the default business logic in supplied methods
adding additional attributes to existing classes
adding additional methods to existing classes

from the report: Complete documentation will be provided �

Example

Two classes: Receipt and Purchase order Line

default attributes, methods
default business logic: inspect Quality on receipt

Extension: enhance this logic

subclass Receipt
override inspection method
change logic to include checks against supplier tables, and hazardous or high value products

San Francisco - issues

Standards: OMG/CORBA Business Issues
Technology Integration:
Compound Documents: Lotus Notes, JavaBeans, Active X
Business process Modeling and Control: workflow engines may be used as glue
Internet/Intranet and Java: applications may be designed
Conclusions: a bit premature ...

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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